Question
Show that when two or more emitter-follower outputs are connected to a common load, as shown in the circuit of Figure P10.54, the OR operation results; that is, $v_o=v_1$ OR $v_2$.
Step 1
An emitter follower (common collector) configuration has its output at the emitter, and the input at the base. The emitter voltage follows the base voltage, minus a base-emitter voltage drop (typically 0.7V for silicon transistors). Show more…
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In the network in Fig. $\mathrm{P} 4.32,$ derive the expression for $v_{o}$ in terms of the inputs $v_{1}$ and $v_{2}.$
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